Corpus: stored XOVER chunks for the grouping sweeps

Ranges marked `capture` keep their XOVER chunks in CORPUS_DIR
(corpus/<group>/<start>-<end>/, edge-bench's layout, range.json once
complete; only chunks that inflate). The prefetcher reads a stored chunk
instead of fetching it, so a reset re-indexes them without the news
server; a chunk a worker reports corrupt goes from the corpus too.

edge-bench gets --releases (release chunks without payload, with their
first subjects) and ships in the edge image; deploy/corpus_sweep.py marks
more ranges (capture), replays the corpus with the deployed build (replay)
and reports suspects and the change since the previous build (report).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/services/leases.ts

@@ -2,6 +2,7 @@ import db from '@adonisjs/lucid/services/db'
 import coordinatorConfig from '#config/coordinator'
 import RuleSets from '#services/rule_sets'
 import Spool from '#services/spool'
+import Corpus from '#services/corpus'
 import type { Lease } from '#lib/edge/index'
 
 export class LeaseLost extends Error {}
@@ -66,7 +67,13 @@ class Leases {
   async corrupt(rangeId: number, nodeId: number, from: number) {
     const range = await this.leased(rangeId, nodeId)
     const span = Spool.chunksOf({ start: Number(range.start_id), end: Number(range.end_id) }).find((s) => s.from === from)
-    if (span) await Spool.removeChunk(rangeId, span)
+    if (span) {
+      await Spool.removeChunk(rangeId, span)
+      if (range.capture) {
+        const group = await db.from('groups').where('id', range.group_id).select('name').first()
+        await Corpus.removeChunk({ group: group.name, start: Number(range.start_id), end: Number(range.end_id) }, span)
+      }
+    }
     const plain: number[] = (range.plain_chunks ?? []).map(Number)
     // Reported once already: the compressed copy may have been in flight (or the prefetcher's targets not
     // refreshed yet) and spooled again (range 161820, LOG.md 2026-10-11), so a second try plain first.